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This CL moves pan_tilt_zoom_allowed from MediaStream to MediaStreamTrack
for consistency with existing pan, tilt, zoom MediaStreamTrack values.

Bug: 934063
Change-Id: Iaa107290100393c51d7309e140adacd24c9e5dfd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2270301
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#783031}